Many conventional iron supplements can cause gastrointestinal side effects – including nausea, vomiting, constipation, diarrhea and dark-coloured stools – because they are poorly absorbed. Thorne’s Iron Bisglycinate provides 25 mg of elemental iron per capsule that has been reacted with glycine for optimal absorption in the gastrointestinal tract, which helps to decrease the typical gastrointestinal side effects of iron supplementation.
An iron deficiency can present as weakness, fatigue, shortness of breath on exertion, dizziness, tinnitus, spots before the eyes, drowsiness, irritability, infrequent menstruation and poor libido.
Those who follow a plant-based or lower protein diet may have needs as high as 1.8 times as much dietary iron, and athletes need approximately 1.5 times as much iron as non-athletes.
Low iron can lead to a reduction in the body’s normal uptake of oxygen to cells. This can lead to a reduction in work capacity and aerobic performance, and when left untreated chronic low levels of iron can contribute to iron-deficient anemia.